Strange behavior of `dwt_coeff_len` and `dwt_max_level`.

[tianrluo]

In [1]: import pywt

In [2]: w = pywt.Wavelet('db2')
   ...: data_len = 23
   ...: level = pywt.dwt_max_level(data_len, w)
   ...: while level > 0:
   ...:     print(data_len, level)
   ...:     data_len = pywt.dwt_coeff_len(data_len, w.dec_len, 'symmetric')
   ...:     level = pywt.dwt_max_level(data_len, w)
   ...: 
23 2
13 2
8 1

I'm using PyWavelets 1.10.0.
I was trying to find how many dwt levels an input data of length 23 will have.
Based on the while loop printouts, I thought the level for 23 should be 3 rather than 2?
I might have misunderstood what dwt_max_level does if this behavior was intended rather than a bug...

Thank you ahead of time for looking into this!

(btw, pywt.__version__ is still showing 1.8.0 b/c of this line.

pywt/util/version_utils.py

Line 6 in 65f19a7

MINOR = 8

I can make a separate issue for __version__ if that's the preferred way to track issue with prs)